Leucorhynchia, Crosse, 1867

Hansen, Thomas, 2019, Gastropods from the Cretaceous-Palaeogene boundary in Denmark, Zootaxa 4654 (1), pp. 1-196 : 75

publication ID

https://doi.org/ 10.11646/zootaxa.4654.1.1

publication LSID

lsid:zoobank.org:pub:CFD82CC0-3110-472E-972B-7ADC0C523A04

persistent identifier

https://treatment.plazi.org/id/BF18F633-A94A-FFAF-2B9C-C073FBA6FC97

treatment provided by

Plazi

scientific name

Leucorhynchia
status

 

Leucorhynchia View in CoL sp.

Figs 22 View FIGURE 22 J–K

Material. Specimen MGUH 33115 is an incomplete external mould.

Occurrence. Lithified top of the Højerup Member of the Maastrichtian Tor Formation at Holtug Quarry, Stevns Klint.

Description. Shell very low trochiform with flattened spire. Nearly planispiral protoconch 0.55 mm wide, consisting of approximately two smooth and only slowly widening flat whorls; whorls separated by deep sutures. Transition to teleoconch not visible.

Teleoconch with around two fairly rapidly widening, adapically flattened whorls. Deep suture situated just above sharply rounded periphery of preceding whorl. Base weakly convex. Aperture and umbilical area unknown. Teleoconch sculpture consisting of a single distinct adapical furrow.

Measurements. Specimen MGUH 33115 is 1.6 mm high and at least 2.4 mm wide, consisting of 3 3/4 whorls.

Remarks. This taxon differs from the middle Danian Leucorhynchia marginata Ravn, 1933 from Denmark by a slightly higher shell and lower protoconch, but seems otherwise quite similar.

MGUH

Museum Geologicum Universitatis Hafniensis

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Trochida

Family

Skeneidae

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